mobile Stop Mobile buttons stacking & changing order of stacked blocks

Site URL: http://www.shiftmovement.org.uk/funded-opportunities

Hey trying to get these two buttons at the bottom of my site to sit side by side on mobile but none of this seems to work. I am onBrine 7.0 

www.shiftmovement.org.uk/funded-opportunities 

password: ShiftMovement1

I am also trying to get the videos in the #testimonials section to stack in a different order. 

The first is correct with the video then the quote but the second needs to do the same. any help appreciated!!!! 

Add to Design > Custom CSS

/* video quote buttons */
@media screen and (max-width:640x) {
div#block-yui_3_17_2_1_1656470757666_90823+.row+.row {
    display: flex;
    flex-direction: column-reverse;
}
div#block-yui_3_17_2_1_1655979507525_43044+.row .span-5 {
    width: 50% !important;
    float: left !important;
}
}